Telephony, network and cable television, music-oriented FM radio, AM talk radio, even satellite radio and television all see their foundations crumbling under the onslaught of the Internet.

FORBES: Golden Times--Even If We Don't Know It

Radio One is also expanding into cable, starting TV One, a black-oriented channel in January--teamed with powerhouse Comcast.

FORBES: Radio Days

Established radio performers such as Benny and Hope, who embraced TV on its own visually oriented terms, flourished well into the '60s.

WSJ: WSJ Sightings: Terry Teachout on the New-Media Crisis of 1949